Technical Switching between flex and non flex tunes on MHD

rev210

Corporal
Feb 24, 2019
235
138
50
Ride
335i - 08 Coupe .
I am running MHD and motive Flex currently with a custom flex map.

The question is can I switch to my old custom 93 Map(non flex) or an E60 etc without disconnecting the module?

The reason is that , when running a custom flex map if you have 0 E it causes a safety to kick in. You can tune that out for the resolution but, I kind of prefer to keep it there. If possible just flicking over to a dedicated 93 map for occasions I am running 93. Both for cleaning out the fuel system and better cold starts in winter (when the extra power of E mix cant be used)
 

rev210

Corporal
Feb 24, 2019
235
138
50
Ride
335i - 08 Coupe .
What safety are you taking about?
If you drop to 0 E content (straight 93) there is a default safety , to protect you in the event of a fault in the flex fuel sensor. Lets say you are running E85 and then the voltage of the sensor suddenly shows 0 E due to a fault. It reverts timing etc to protect the motor , while displaying E100.
 

KevinC39

Corporal
Jun 27, 2017
234
118
0
Ride
335i
Where do you get straight 93? Everything around here is 10% ethanol. I think I've seen one pump with ethanol free 90 octane but that's it
 

rev210

Corporal
Feb 24, 2019
235
138
50
Ride
335i - 08 Coupe .
Where do you get straight 93? Everything around here is 10% ethanol. I think I've seen one pump with ethanol free 90 octane but that's it
I am in Australia. All fuels sold with ethanol have "E" content on the label. So E10 or E85 . The non E fuels dominate , so from 89, 91 and 93
 
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rev210

Corporal
Feb 24, 2019
235
138
50
Ride
335i - 08 Coupe .
Now that we have further explored my reasons , back to the actual question.

With flex module installed , can we switch to a previous non-flex 93 cutom tune without pulling out the motive flex fuel module?
 

zomski101

Private
Dec 28, 2019
47
8
0
Ride
335i
Stumbled upon this thread when I was reading into evap readiness and emissions. If you want more assurance I would just contact motiv.

 

rev210

Corporal
Feb 24, 2019
235
138
50
Ride
335i - 08 Coupe .
Stumbled upon this thread when I was reading into evap readiness and emissions. If you want more assurance I would just contact motiv.

Looks like it needs an switch to disconnect the couple of wires to the motive box. CheersšŸ‘
 

rev210

Corporal
Feb 24, 2019
235
138
50
Ride
335i - 08 Coupe .
For those Interested , you can switch custom maps from flex to non flex without issues. Works fine. You get some shadow codes but, nothing that will interfere.
 
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